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    Solar Controller 12/24 V

    I have blown my controller by putting too much voltage into it via the PV panels 67 volts instead of under 50 . Looking inside I see only one component is toast . It is marked on the board as ZR1 I assume its a zener although the package looks like a polyswitch. What do you think it would be...
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    555 timer ?

    Most 555 timers have an input voltage DC limitation of say 5V.-12V Is it possible to place it in a 300 volt circuit in any way by limiting its voltage with resistors and the amount of current flowing to its sense triggers?
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    TVS Transient Voltage Suppressor

    This device given a part number of say '1.5KE350' I have not used before . I understand it to be just a zener diode in fact but it won't conduct until it reaches 1.5K volts ,is that right? Its noted as 350 amps so I'm confused . Does it only conduct if the voltage goes over 1.5K v or does it...
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    SM12 ?

    I have a circuit with a dc photovoltaic string of about 280 volts feeding into this. The circuit calls for a SM12 chip with I think 4 pins. I guessed it was a voltage regulator of some kind but all the googled datasheets give different devices and none seem to fit this . Can anyone tell me what...
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